/**
 * 
 */
function check() {
	var identity_number = document.getElementByid("identity_number");
	var person_name = document.getElementByName("person_name");
	var birth_time = document.getElementByName("birth_time");
	var gender = document.getElementByName("gender");
		if (form.identity_number.value == ""
				&& ((form.peson_name.value == "" && form.birth_time.value == "")
						|| (form.peson_name.value == "" && form.gender.value == "") 
						|| (form.gender.value == "" && form.birth_time.value == ""))) {
			alert("请输入身份证号码或者其他的两项以上!");
			form.identity_number.focus();
			return false;
		}
   return true;
}